Patent US3174848A successfully refreshed from Google Patents.
Patent US2940737A successfully refreshed from Google Patents.
US2940737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Houdaille Industries Inc
•
Filing: 1955-04-08
•
Granted: 1960-06-14
•
Expires: 1975-04-08
Abstract
No abstract record available.
Inventors
- 👤 Ray A Sandberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:45
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1125113A
Cited
US1982075A
Cited
US1971723A
Cited
US2091584A
Cited
US2092170A
Cited
US2245069A
Cited
US2281299A
Cited
US2382340A
Cited
US2602649A
Cited
US2585043A
Cited
US2666981A
Cited
US2646971A
Cited
US2620170A
Cited
US2688794A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |